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1、Non-zonalApproachesforGreyAreaMitigationC.Mockett,M.Fuchs,F.Thiele,S.Wallin,S.H.Peng,S.Deck,J.C.Kok,H.vanderVen,A.Garbaruk,M.Shur,M.StreletsandA.Travin1IntroductionThetermnon-zonalapproachisappliedinGo4HybridtorefertohybridRANS-LESmethodsinwhichthemodel,nottheuser,definesther
2、egionsinwhichRANSandLESmodesareactive.Suchmethodsareinherentlymoreapplicabletocomplexgeometriesthanembeddedapproaches,howevertheyaremoresusceptibletothegreyareaproblem.C.Mockett(&)M.FuchsF.ThieleCFDSoftwareEntwicklungs-undForschungsgesellschaftmbH(CFDB),Bismarckstr.10-12,1
3、0625Berlin,Germanye-mail:charles.mockett@cfd-berlin.comS.WallinS.H.PengUnitofAeronauticalandAutonomousSystems,SwedishDefenceResearchAgency,FOI,16490Stockholm,SwedenS.DeckONERA,TheFrenchAerospaceLab,92190Meudon,Francee-mail:sebastien.deck@onera.frJ.C.KokH.vanderVenNetherlan
4、dsAerospaceCentreNLR,AnthonyFokkerweg2,1059Amsterdam,CM,NetherlandsA.GarbarukM.ShurM.StreletsA.TravinNewTechnologiesandServices(NTS),5A,KrasnogoKursantaStreet,197198St.-Petersburg,RussiaA.GarbarukM.ShurM.StreletsA.TravinSt.-PetersburgPolytechnicUniversity,29,Polytechni
5、cheskayaStreet,195258St.-Petersburg,Russia©SpringerInternationalPublishingAG201817C.Mockettetal.(eds.),Go4Hybrid:GreyAreaMitigationforHybridRANS-LESMethods,NotesonNumericalFluidMechanicsandMultidisciplinaryDesign134,DOI10.1007/978-3-319-52995-0_218C.Mockettetal.Thischapterde
6、scribesthevariousapproachesforgreyareamitigationproposedbytherelevantpartnersfornon-zonalhybridapproaches.Asfaraspossible,detaileddescriptionsareprovidedtoencouragetheimplementationoftheapproachesindifferentcodes.Allmethodshaveincommontheaimtodestabilisetheearlyseparatedshea
7、rlayer.Somemethodsapplystochasticforcingtothisend,whereasothersseektoreducethedampinginfluenceofeddyviscosityhere.Animportantsecondarygoalhasbeentodevelopapproachesthatareasfaraspossiblegenerallyapplicableandsuitableforthesimulationofcomplexgeometries.Thegreyareamitigation(GA
8、M)strategiesareasfaraspossibledecoupledfromtheunderlyinghybridRANS-LESmetho
